Add simple Tic-Tac-Toe game in C

tictactoe.c

@@ -0,0 +1,91 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define SIZE 3
+
+void initializeBoard(char board[SIZE][SIZE]) {
+    for (int i = 0; i < SIZE; ++i) {
+        for (int j = 0; j < SIZE; ++j) {
+            board[i][j] = '1' + i * SIZE + j;
+        }
+    }
+}
+
+void printBoard(char board[SIZE][SIZE]) {
+    printf("\n");
+    for (int i = 0; i < SIZE; ++i) {
+        for (int j = 0; j < SIZE; ++j) {
+            printf(" %c ", board[i][j]);
+            if (j < SIZE - 1) printf("|");
+        }
+        printf("\n");
+        if (i < SIZE - 1) printf("---+---+---\n");
+    }
+    printf("\n");
+}
+
+int checkWin(char board[SIZE][SIZE]) {
+    for (int i = 0; i < SIZE; ++i) {
+        if (board[i][0] == board[i][1] && board[i][1] == board[i][2])
+            return board[i][0] == 'X' ? 1 : board[i][0] == 'O' ? 2 : 0;
+        if (board[0][i] == board[1][i] && board[1][i] == board[2][i])
+            return board[0][i] == 'X' ? 1 : board[0][i] == 'O' ? 2 : 0;
+    }
+    if (board[0][0] == board[1][1] && board[1][1] == board[2][2])
+        return board[0][0] == 'X' ? 1 : board[0][0] == 'O' ? 2 : 0;
+    if (board[0][2] == board[1][1] && board[1][1] == board[2][0])
+        return board[0][2] == 'X' ? 1 : board[0][2] == 'O' ? 2 : 0;
+    return 0;
+}
+
+int isDraw(char board[SIZE][SIZE]) {
+    for (int i = 0; i < SIZE; ++i)
+        for (int j = 0; j < SIZE; ++j)
+            if (board[i][j] != 'X' && board[i][j] != 'O')
+                return 0;
+    return 1;
+}
+
+int main(void) {
+    char board[SIZE][SIZE];
+    int currentPlayer = 1; // 1 -> X, 2 -> O
+    int choice;
+    initializeBoard(board);
+
+    while (1) {
+        printBoard(board);
+        printf("Player %d [%c], enter your move (1-9): ", currentPlayer, currentPlayer == 1 ? 'X' : 'O');
+        if (scanf("%d", &choice) != 1) {
+            fprintf(stderr, "Invalid input\n");
+            return 1;
+        }
+        if (choice < 1 || choice > 9) {
+            printf("Invalid move. Try again.\n");
+            continue;
+        }
+        int row = (choice - 1) / SIZE;
+        int col = (choice - 1) % SIZE;
+        if (board[row][col] == 'X' || board[row][col] == 'O') {
+            printf("Cell already taken. Try again.\n");
+            continue;
+        }
+        board[row][col] = currentPlayer == 1 ? 'X' : 'O';
+        int result = checkWin(board);
+        if (result == 1) {
+            printBoard(board);
+            printf("Player 1 (X) wins!\n");
+            break;
+        } else if (result == 2) {
+            printBoard(board);
+            printf("Player 2 (O) wins!\n");
+            break;
+        } else if (isDraw(board)) {
+            printBoard(board);
+            printf("It's a draw!\n");
+            break;
+        }
+        currentPlayer = 3 - currentPlayer; // toggle between 1 and 2
+    }
+    return 0;
+}
+